Dr.-Ing. Friedhard Römer

2025

• Alhussien Ali Marouf I., Römer F., Schilling M., Biebler F., Höpfner J., Grigoletto M., Wernicke T., Kneissl M., Witzigmann B.:
  Analysis of effective carrier mobility in the multi-quantum wells of DUV AlGaN LEDs by carrier transport simulations
  OPTO (San Francisco, 25. Januar 2025 – 31. Januar 2025)
  In: Proceedings Volume PC13360, Physics and Simulation of Optoelectronic Devices XXXIII 2025
  DOI: 10.1117/12.3042015
• Utsch B., Römer F., Faber S., Bertram F., Schmidt G., Veit P., Berger C., Dadgar A., Strittmatter A., Christen J., Witzigmann B.:
  Modelling Electron Beam Induced Current in III-Nitride Light Emitting Diodes
  2025 International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2025 (Lodz, POL, 14. September 2025 – 18. September 2025)
  In: Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2025
  DOI: 10.1109/NUSOD64393.2025.11199473

2024

• Cardinali G., Kölle S., Schulz A., Susilo N., Hauer Vidal D., Guttmann M., Blonski MA., Römer F., Witzigmann B., Nippert F., Wagner MR., Wernicke T., Kneissl M.:
  Gain Characteristics of Optically Pumped UVC Lasers with Wide AlGaN Single-Quantum-Well Active Regions
  In: physica status solidi (a) (2024)
  ISSN: 1862-6300
  DOI: 10.1002/pssa.202400067
• Faber S., Römer F., Witzigmann B.:
  Simulation Study of Aluminum Nitride TrenchFETs with Polarization-Induced Doping
  In: physica status solidi (a) (2024)
  ISSN: 1862-6300
  DOI: 10.1002/pssa.202400045
• Hofmann G., Muhin A., Susilo N., Römer F., Wernicke T., Kneissl M., Witzigmann B.:
  Simulation of Carrier Injection Efficiency in AlGaN-based UV-light-emitting Diodes
  In: IEEE Photonics Journal (2024), S. 1-8
  ISSN: 1943-0655
  DOI: 10.1109/JPHOT.2024.3430488
• Hopfner J., Kuhl F., Schilling M., Muhin A., Guttmann M., Hofmann G., Römer F., Wernicke T., Witzigmann B., Kneissl M.:
  Unraveling carrier distribution in far-UVC LEDs by temperature-dependent electroluminescence measurements
  In: Applied Physics Letters 125 (2024), Art.Nr.: 071109
  ISSN: 0003-6951
  DOI: 10.1063/5.0223284
• Jeddi H., Adham K., Zhao Y., Witzigmann B., Römer F., Bermeo M., Borgström MT., Pettersson H.:
  Enhanced LWIR response of InP/InAsP quantum discs-in-nanowire array photodetectors by photogating and ultra-thin ITO contacts
  In: Nanotechnology 35 (2024), Art.Nr.: 215206
  ISSN: 0957-4484
  DOI: 10.1088/1361-6528/ad2bd0
• Kölle S., Römer F., Cardinali G., Schulz A., Susilo N., Hauer Vidal D., Wernicke T., Kneissl M., Witzigmann B.:
  Optical Gain in AlGaN Quantum Wells: Impact of Higher Energy States
  In: IEEE Photonics Journal 16 (2024), S. 1-5
  ISSN: 1943-0655
  DOI: 10.1109/JPHOT.2024.3379231
• Römer F., Hofmann G., Hoopfner J., Schilling M., Muhin A., Wernicke T., Kneissl M., Witzigmann B.:
  Carrier Transport in a Deep Ultraviolet Mixed Quantum Well Light Emitting Diode
  In: IEEE Photonics Journal (2024), S. 1-6
  ISSN: 1943-0655
  DOI: 10.1109/JPHOT.2024.3351965

2023

• Kolle S., Römer F., Cardinali G., Schultz A., Susilo N., Vidal DH., Wernicke T., Kneissl M., Witzigmann B.:
  Simulation of optical gain in AlGaN quantum wells
  23rd International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2023 (Turin, 18. September 2023 – 21. September 2023)
  In: Paolo Bardella, Alberto Tibaldi (Hrsg.): Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2023
  DOI: 10.1109/NUSOD59562.2023.10273539
• Römer F., Hofmann G., Höpfner J., Schilling M., Muhin A., Wernicke T., Kneissl M., Witzigmann B.:
  Effect of the Hole Mobility on the Emission Spectrum of a Deep Ultraviolet Mixed Quantum Well Light Emitting Diode
  23rd International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2023 (Turin, ITA, 18. September 2023 – 21. September 2023)
  In: Paolo Bardella, Alberto Tibaldi (Hrsg.): Proceedings of the International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2023
  DOI: 10.1109/NUSOD59562.2023.10273498
• Witzigmann B., Römer F.:
  Polarization induced doping for carrier transport in graded III-nitride layers: a simulation study
  Physics and Simulation of Optoelectronic Devices XXXI 2023 (San Francisco, CA, USA, 31. Januar 2023 – 2. Februar 2023)
  In: Bernd Witzigmann, Marek Osinski, Yasuhiko Arakawa (Hrsg.): Proceedings of SPIE – The International Society for Optical Engineering 2023
  DOI: 10.1117/12.2652797

2022

• Chavarin CA., Hardt E., Skibitzki O., Voss T., Eissa M., Spirito D., Capellini G., Baldassarre L., Flesch J., Piehler J., You C., Gruessing S., Römer F., Witzigmann B.:
  Terahertz subwavelength sensing with bio-functionalized germanium fano-resonators
  In: Frequenz (2022)
  ISSN: 0016-1136
  DOI: 10.1515/freq-2022-0078

2021

• Römer F., Guttmann M., Wernicke T., Kneissl M., Witzigmann B.:
  Effect of Inhomogeneous Broadening in Ultraviolet III-Nitride Light-Emitting Diodes
  In: Materials 14 (2021)
  ISSN: 1996-1944
  DOI: 10.3390/ma14247890

2017

• Römer F., Witzigmann B.:
  Luminescence distribution in the multi-quantum well region of III-nitride light emitting diodes
  Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI 2017
  DOI: 10.1117/12.2253668

2014

• Römer F., Witzigmann B., Deppner M., Range C.:
  Auger recombination and leakage in InGaN/GaN quantum well LEDs
  Gallium Nitride Materials and Devices IX (San Francisco, CA)
  DOI: 10.1117/12.2037043

2013

• Römer F., Witzigmann B.:
  Computational modelling of surface effects in InGaN/GaN quantum disk nano wire LEDs
  Physics and Simulation of Optoelectronic Devices XXI (San Francisco, CA)
  DOI: 10.1117/12.2006182